No problem, we've got 1620 and 6264 to multiply
1620 × 6264 = 6264 × (1620)
+ 6264 × 0 which equals 0
+ 6264 × 20 what gives us 125280
+ 6264 × 600 yielding 3758400
+ 6264 × 1000 yielding 6264000

= 10147680
